WO2019085408A1 - Procédé, dispositif et système de régulation de température de magnétron, alimentation électrique à fréquence variable, et dispositif hyperfréquence - Google Patents

Procédé, dispositif et système de régulation de température de magnétron, alimentation électrique à fréquence variable, et dispositif hyperfréquence Download PDF

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Publication number
WO2019085408A1
WO2019085408A1 PCT/CN2018/083390 CN2018083390W WO2019085408A1 WO 2019085408 A1 WO2019085408 A1 WO 2019085408A1 CN 2018083390 W CN2018083390 W CN 2018083390W WO 2019085408 A1 WO2019085408 A1 WO 2019085408A1
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Prior art keywords
magnetron
variable frequency
anode
power supply
frequency power
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PCT/CN2018/083390
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English (en)
Chinese (zh)
Inventor
官继红
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深圳麦格米特电气股份有限公司
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Priority to KR1020207014410A priority Critical patent/KR102319930B1/ko
Priority to EP18873316.6A priority patent/EP3706512B1/fr
Priority to JP2020524364A priority patent/JP6987989B2/ja
Publication of WO2019085408A1 publication Critical patent/WO2019085408A1/fr
Priority to US16/857,314 priority patent/US11696376B2/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H05B6/681—Circuits comprising an inverter, a boost transformer and a magnetron
    • H05B6/682—Circuits comprising an inverter, a boost transformer and a magnetron wherein the switching control is based on measurements of electrical values of the circuit
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/666—Safety circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H05B6/681—Circuits comprising an inverter, a boost transformer and a magnetron
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/664—Aspects related to the power supply of the microwave heating apparatus
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/04—Heating using microwaves
    • H05B2206/043—Methods or circuits intended to extend the life of the magnetron

Definitions

  • the present application relates to the field of microwave devices, and in particular, to a magnetron temperature adjustment method and device thereof, a controller, a frequency conversion power supply, a magnetron temperature adjustment system, and a microwave device.
  • Microwave equipment is widely used in various fields, including industrial, military, and civilian fields.
  • Conventional microwave devices are capable of driving a magnetron to generate microwaves that cause microwaves to affect the load of the microwave device.
  • the purpose of the embodiments of the present application is to provide a method for controlling the temperature of a magnetron, a device thereof, a controller, a variable frequency power supply, a temperature control system for a magnetron, and a microwave device, which solve the problem that the magnetron is easy to work in the conventional technology.
  • the embodiment of the present application provides the following technical solutions:
  • an embodiment of the present application provides a method for adjusting a temperature of a magnetron, the method comprising: determining an anode current flowing through a magnetron or an input power of a variable frequency power source or an anode voltage applied to both ends of the magnetron, The input power or output power of the variable frequency power supply is used to drive the magnetron to operate; and the output power of the variable frequency power supply is adjusted according to the anode current or the input power or the anode voltage.
  • the adjusting the output power of the variable frequency power supply according to the anode voltage comprises: determining an anode voltage applied to both ends of the magnetron, an equivalent resistance of the magnetron, and the variable frequency power supply Output power; calculating an anode threshold voltage of the magnetron according to an anode voltage of the magnetron, an equivalent resistance of the magnetron, and an output power of the variable frequency power supply; according to the magnetron The anode threshold voltage adjusts the output power of the variable frequency power supply.
  • the determining the output power of the variable frequency power supply comprises: acquiring an input power and an input voltage of the variable frequency power supply; and calculating a corresponding relationship according to an input power, an input voltage, and a power efficiency of the variable frequency power supply. The output power of the variable frequency power supply.
  • the adjusting the output power of the variable frequency power supply according to the anode threshold voltage of the magnetron comprises: calculating an anode temperature of the magnetron according to an anode threshold voltage of the magnetron; The anode temperature of the magnetron adjusts the output power of the variable frequency power supply.
  • the adjusting the output power of the variable frequency power supply according to the anode temperature of the magnetron comprises: determining whether the anode temperature of the magnetron is greater than a preset temperature threshold; if greater than, reducing the output of the variable frequency power supply Power; if less than, maintain the operation of the variable frequency power supply.
  • the reducing the output power of the variable frequency power supply includes: determining an output power of the variable frequency power supply; determining whether an output power of the variable frequency power supply is greater than a preset minimum power; if greater than, maintaining the variable frequency power supply The work; if less than, stop the work of the variable frequency power supply.
  • the adjusting the output power of the variable frequency power supply according to the anode threshold voltage of the magnetron comprises: acquiring a preset association table, wherein the correlation table prestores an anode threshold voltage of the magnetron and the variable frequency power supply a mapping relationship between output powers; finding an output power corresponding to an anode threshold voltage of the magnetron from the preset correlation table; and adjusting an output power of the variable frequency power supply to the found output power.
  • the determining an anode voltage applied to both ends of the magnetron includes: determining an anode voltage corresponding to an input power of the variable frequency power source as an anode when an input power of the variable frequency power source falls within a preset power range Threshold voltage.
  • an embodiment of the present application provides a magnetron temperature adjustment device, the device comprising: a determining module, configured to determine an anode current flowing through a magnetron or an input power of a variable frequency power source or loaded on a magnetron An anode voltage at both ends, an input power or an output power of the variable frequency power source for driving the magnetron to operate; an adjustment module, configured to adjust the frequency conversion according to the anode current or the input power or the anode voltage The output power of the power supply.
  • an embodiment of the present application provides a controller, where the controller includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory is stored with the At least one processor executes instructions that are executed by the at least one processor to enable the at least one processor to perform the magnetron temperature adjustment method of any of the above.
  • an embodiment of the present application provides a variable frequency power supply for driving a magnetron, the variable frequency power supply comprising: an inverter circuit for driving the magnetron; and a first voltage sampling circuit for sampling a first output voltage of the inverter circuit, wherein the first output voltage has a corresponding relationship with an anode voltage applied across the magnetron, the first voltage sampling circuit including a first input end, a second input end, and a first input voltage An output end, the first input end is connected to a first node between the frequency conversion circuit and the magnetron, and the second input end is connected between the frequency conversion circuit and the magnetron a second node; the controller is respectively connected to the first output end of the first voltage sampling circuit and the frequency conversion circuit, and the controller is loaded on the magnetron according to the first output voltage
  • the anode voltage of the magnetron is calculated by the correspondence of the anode voltages at both ends.
  • variable frequency power supply further includes an amplifying circuit, an input end of the amplifying circuit is connected to a first output end of the first voltage sampling circuit, and an output end of the amplifying circuit is connected to the controller.
  • an embodiment of the present application provides a magnetron temperature adjustment system, the system comprising: a magnetron; a variable frequency power supply connected to the magnetron for driving the magnetron; a voltage sampling circuit coupled between the variable frequency power supply and the magnetron for sampling a second output voltage of the variable frequency power supply, the second output voltage and an anode voltage applied to both ends of the magnetron Corresponding relationship; the controller is respectively connected to the output end of the second voltage sampling circuit and the variable frequency power supply, and the controller is loaded on both ends of the magnetron according to the second output voltage Based on the corresponding relationship of the anode voltages, the anode voltage across the magnetron is calculated.
  • an embodiment of the present application provides a microwave device, where the microwave device includes the foregoing controller.
  • an embodiment of the present application provides a non-transitory computer readable storage medium, where the non-transitory computer readable storage medium stores computer executable instructions for causing a microwave device to execute The magnetron temperature adjustment method according to any of the above.
  • the input current of the anode current or the variable frequency power source flowing through the magnetron or the anode voltage applied to both ends of the magnetron is determined, and the input power or output power of the variable frequency power source is used to drive the magnetron.
  • Work secondly, adjust the output power of the variable frequency power supply based on the anode current or input power or anode voltage. Therefore, it can adjust the output power of the variable frequency power supply in time to adjust the anode temperature of the magnetron to avoid excessive temperature damage of the magnetron.
  • FIG. 1 is a schematic structural diagram of a microwave device according to an embodiment of the present application.
  • 1a is a schematic diagram of an equivalent circuit model of a magnetron according to an embodiment of the present application
  • FIG. 1b is a schematic diagram showing changes in an anode voltage applied to both ends of a magnetron and an anode current following a change in a magnetron according to an embodiment of the present application;
  • FIG. 2 is a schematic structural diagram of another microwave device according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram showing the relationship between the anode temperature and the anode voltage of a 1KW, 2450M magnetron according to an embodiment of the present application;
  • FIG. 4 is a schematic diagram showing the relationship between power efficiency, input power, and input voltage of a variable frequency power supply according to an embodiment of the present application
  • FIG. 5 is a schematic structural diagram of a first voltage sampling circuit according to an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a first voltage sampling circuit according to another embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a microwave device according to another embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a microwave device according to still another embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a second voltage sampling circuit according to an embodiment of the present application.
  • FIG. 8a is a schematic diagram showing changes in an anode voltage applied to both ends of a magnetron and a second output voltage sampled by a second voltage sampling circuit according to an embodiment of the present application;
  • FIG. 9 is a schematic structural diagram of a controller according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a magnetron temperature adjusting device according to an embodiment of the present application.
  • Figure 10a is a schematic structural view of the adjustment module of Figure 10;
  • Figure 11 is a schematic structural view of the determining unit of Figure 10a;
  • Figure 12 is a schematic structural view of the adjusting unit of Figure 10a;
  • Figure 13 is another schematic structural view of the adjusting unit of Figure 10a;
  • Figure 14 is a schematic structural view of the first regulating subunit of Figure 12;
  • 15 is a schematic flow chart of a method for adjusting a temperature of a magnetron according to an embodiment of the present application
  • Figure 15a is a schematic flow chart of step 52 in Figure 15;
  • Figure 16 is a schematic flow chart of step 521 in Figure 15a;
  • Figure 17 is a schematic flow chart of step 523 of Figure 15a;
  • FIG 18 is another schematic flow chart of step 523 of Figure 15a;
  • FIG. 19 is a schematic flow chart of step 5233 in FIG. 17;
  • FIG. 20 is a schematic flow chart of step 52332 in FIG. 19.
  • the microwave device provided by the embodiment of the present application includes an industrial microwave device, a medical microwave device, a civilian microwave device, a military microwave device, and the like.
  • industrial microwave equipment can be used to rapidly heat, dry, and modify materials.
  • medical microwave equipment can be used for sterilization of drugs and ablation of lesions.
  • civilian microwave equipment can be used for micro-heated food and the like.
  • microwave devices can be used as target detection to navigate and the like.
  • the microwave device provided by the embodiment of the present application may be a variable frequency microwave device, or may be other types of microwave devices.
  • FIG. 1 is a schematic structural diagram of a microwave device according to an embodiment of the present application.
  • the microwave device 10 includes a variable frequency power supply 11 , a magnetron 12 , a working cavity 13 , and a cooling unit 14 .
  • the variable frequency power supply 11 is connected to the magnetron 12 .
  • the variable frequency power supply 11 includes a rectification filtering unit 111, a power conversion unit 112, a high voltage transformer 113, a high voltage rectification filtering unit 114, and an internal controller 116.
  • the input end of the rectifying and filtering unit 111 is used for accessing an external power source, the output end of the rectifying and filtering unit 111 is connected to the input end of the power converting unit 112, and the output end of the power converting unit 112 is connected to the primary winding of the high voltage transformer 113, and the high voltage transformer
  • the secondary winding of 113 is connected to the input of the high voltage rectification filtering unit 114, the output of the high voltage rectification filtering unit 114 is connected to the magnetron 12, and the controller 115 is connected to the power conversion unit 112.
  • the variable frequency power supply 11 is capable of driving the magnetron 12 to operate to provide the desired voltage and current to the magnetron 12.
  • the rectifying and filtering unit 111 is configured to access an external power source, and perform rectification and filtering processing on the external power source to output a DC voltage.
  • the external power source may be a mains voltage or an industrial voltage.
  • the internal controller 116 collects input voltage, current and other information, calculates the actual operating input power, and converts it into a required pulse width modulation signal (Pulse Width Modulation, PWM) or pulse frequency modulation signal (Pulse Frequency Modulation (PFM) or The mixed wave of the two is used to drive the power conversion unit 112 to operate at the rated power.
  • PWM pulse width modulation signal
  • PFM pulse frequency modulation signal
  • the mixed wave of the two is used to drive the power conversion unit 112 to operate at the rated power.
  • the high voltage rectifying and filtering unit 114 After the output of the high voltage transformer 113 is processed by the high voltage rectifying and filtering unit 114, the high voltage rectifying and filtering unit 114 outputs a smooth DC high voltage supply to the anode of the magnetron 12, and at the same time, it also supplies a filament voltage to the filament of the magnetron 12. .
  • the magnetron 12 is capable of converting the electrical energy provided by the variable frequency power supply 11 into a corresponding microwave, and heating the load 131 placed in the working cavity 13, for example, when the microwave device is a microwave oven, the working cavity 13 is placed to be slightly heated. food.
  • FIG. 1a is a schematic diagram of an equivalent circuit model of a magnetron according to an embodiment of the present application.
  • the equivalent circuit model can be equivalent to a circuit model in which the Zener diode ZD is connected in series with the equivalent resistor R.
  • the stable voltage of the Zener diode ZD is magnetic.
  • the anode threshold voltage of the control tube 12 and the equivalent resistance R are the equivalent internal resistance of the magnetron 12.
  • FIG. 1b is a schematic diagram of a variation of an anode voltage applied to both ends of a magnetron and an anode current following a change in a magnetron according to an embodiment of the present application.
  • the ordinate of the coordinate axis is the anode voltage
  • the anode voltage is Ebm
  • the abscissa is time
  • the time is t.
  • the anode threshold voltage is VT.
  • the ordinate of the coordinate axis 1b2 is the anode current
  • the anode current is It
  • the abscissa is time t.
  • the grid side power supply is gradually increased, and the absolute value of the anode output voltage of the variable frequency power source 11 is gradually increased, and gradually increases to the anode voltage corresponding to point a, that is, reaching the magnetron 12
  • the anode threshold voltage VT at which point the anode current It begins to flow through the magnetron 12.
  • the power frequency power supply continues to increase, the absolute value of the anode current It gradually increases, and the absolute value of the anode voltage also gradually increases.
  • the power-on time exceeds 5 microseconds, the power frequency power supply starts to drop, and the anode voltage Ebm decreases accordingly, until the anode voltage corresponding to point b is reached. After the point b, since the anode voltage Ebm is insufficient to drive the magnetron 12, The anode current It drops to zero.
  • the anode voltage is equal to the anode threshold voltage, and the user can choose to collect the anode voltage at point a or b to quickly calculate the anode threshold voltage.
  • Ebm VT + R * It, where a ⁇ t ⁇ b.
  • the cooling unit 14 can take away the heat generated when the variable frequency power supply 11 and the magnetron 12 operate, so that the variable frequency power supply 11 and the magnetron 12 can operate reliably and stably.
  • the rectifying and filtering unit 111, the power converting unit 112, the high voltage transformer 113, and the high voltage rectifying and filtering unit 114 may be summarized as an inverter circuit, that is, a rectifying and filtering unit 111, a power converting unit 112, a high voltage transformer 113, and a high voltage rectification unit.
  • the function of the filtering unit 114 can be implemented in the form of an inverter circuit.
  • variable frequency driving power source for driving the magnetron 12 in addition to the various electrical units (for example, the rectifying and filtering unit 111, the power converting unit 112, the high voltage transformer 113, and the high voltage rectifying and filtering unit 114) described above, in addition, it can also add other electrical units to the inverter circuit according to business needs to further realize other application requirements.
  • the microwave device 10 is liable to cause the easy operation of the magnetron 12 in an over-temperature state due to the uncertainty of the load 131.
  • the moisture of the corn is still acceptable, and the microwave output from the magnetron is mostly absorbed by the corn, and the temperature rise of the magnetron at this time is relatively low.
  • the popcorn process is about to end, the moisture content of the corn is small, and most of the microwaves are not absorbed by the corn and are reflected back into the magnetron, which causes the magnetron temperature to rise sharply.
  • the proportion of magnetron damage in household microwave oven damage is 50%, and the main cause of magnetron damage is over temperature.
  • industrial microwave equipment is often used for drying materials.
  • the material has sufficient water content, and the temperature rise of the magnetron is controllable.
  • the water content of the material is low, and a large amount of microwaves are reflected back into the magnetron, causing the magnetron to heat up violently, which may easily cause overheating damage of the magnetron.
  • the common 2450M industrial microwave equipment has a higher proportion of magnetron damage, and the annual damage rate is as high as 15%. The main reason is over temperature.
  • the embodiment of the present application provides another microwave device.
  • the variable frequency power supply in the microwave device 10 further includes a first voltage sampling circuit 117, and the first voltage sampling circuit 117 includes a first input end 117a, The second input end 117b and the first output end 117c are connected to the first node 116a between the frequency conversion circuit and the magnetron 12, and the second input end 117b is connected between the frequency conversion circuit and the magnetron 12.
  • the second node 116b is connected to the first node 116a between the frequency conversion circuit and the magnetron 12.
  • the specific working principle of the microwave device adjusting the anode temperature of the magnetron is as follows:
  • variable frequency power supply 11 operates in accordance with the set power.
  • the set power can be the default initial power inside the variable frequency power supply 11 .
  • internal controller 116 receives the anode voltage of the magnetron fed back by first voltage sampling circuit 117.
  • the internal controller 116 can then calculate the anode temperature of the magnetron 12 based on the anode voltage of the magnetron 12.
  • FIG. 3 is a schematic diagram showing the relationship between the anode temperature and the anode threshold voltage of a 1KW, 2450M magnetron according to an embodiment of the present application.
  • the abscissa represents the anode threshold voltage of the magnetron 12
  • the ordinate represents the anode temperature of the magnetron 12.
  • the anode temperature of the magnetron 12 is gradually increased, and the corresponding anode threshold voltage is correspondingly increased.
  • the anode threshold voltage of the magnetron light 12 has risen to about -3100 volts. At this time, the life of the magnetron 12 is drastically shortened, and the magnet attached to the anode of the magnetron is also at risk of detonation at any time.
  • the anode temperature ta of the magnetron 12 has a positive correlation with the anode threshold voltage VT, and such a relationship can be described by the following formula (1):
  • FIG. 4 is a schematic diagram showing the relationship between power efficiency, input power, and input voltage of a variable frequency power supply according to an embodiment of the present application.
  • the abscissa represents the input power of the variable frequency power supply
  • the ordinate represents the power efficiency of the variable frequency power supply.
  • the power efficiency of the variable frequency power supply is positively correlated with the input power.
  • the power efficiency of the variable frequency power supply is positively correlated with the input voltage.
  • variable frequency power supply operates in the set power operation mode, and the actual operating input power Pin is known.
  • output power Po can be calculated by the following formula (3):
  • the anode voltage Ebm can be calculated by the following equation (4) by collecting the anode current It of the magnetron:
  • the internal controller 116 calculates the anode voltage Ebm across the magnetron 12 based on the first output voltage V0 of the first voltage sampling circuit 117 sampling the frequency conversion circuit, that is, the anode voltage Ebm is known.
  • the anode voltage of the magnetron 12 is generally greater than 1000 volts, and the collection cost of the anode voltage Ebm of the magnetron 12 directly collected by the external voltage detecting device is relatively high, and the collection difficulty is high. Therefore, in this embodiment, the anode voltage Ebm is indirectly derived by collecting the first output voltage of the frequency conversion circuit, which is simple and easy to implement and saves cost.
  • the internal controller 116 acquires the input power Pin of the variable frequency power supply 11 and the input voltage Vin, according to the correspondence between the input power Pin, the input voltage Vin, and the power efficiency EFF of the variable frequency power supply 11 (in combination with the equation shown in FIG. 4 (2) )), determined to the power efficiency EFF. Then, the internal controller 116 calculates the output power Po of the variable frequency power supply 11 based on the equation (3). Next, the internal controller 116 is based on the following equation:
  • the internal controller 116 combines the equation (1) to calculate the anode temperature of the magnetron 12 based on the anode threshold voltage of the magnetron 12.
  • the internal controller 116 adjusts the output power Po of the variable frequency power supply 11 according to the anode temperature of the magnetron 12, wherein the output power Po is used to drive the magnetron 11 to operate to change the anode temperature of the magnetron 11.
  • the internal controller 116 determines whether the anode temperature of the magnetron 12 is greater than a preset temperature threshold. If it is greater than, reduces the output power Po of the variable frequency power source 11 to lower the anode temperature of the magnetron 12. If it is less than, the operation of the variable frequency power supply 11 is maintained, that is, the original output power Po of the variable frequency power supply 11 can be maintained, and the output of the variable frequency power supply 11 can be improved under the premise that the anode temperature of the magnetron 12 is less than the preset temperature threshold. Power Po.
  • the preset temperature threshold here is set by the user according to the business needs.
  • the internal controller 116 when the internal controller 116 reduces the output power Po of the variable frequency power supply 11 when the anode temperature of the magnetron 12 is greater than the preset temperature threshold, the internal controller 116 determines whether the output power Po of the variable frequency power supply 11 is greater than The preset minimum power, if greater, maintains the operation of the variable frequency power supply 11 and continues to detect the anode temperature of the magnetron 12. If it is smaller, it indicates that the variable frequency power supply 11 has lost the ability to control the anode temperature of the magnetron 12. At this time, even if the variable frequency power supply 11 is operated at the preset minimum power, the anode temperature of the magnetron 12 will still be over temperature.
  • the internal controller 116 should stop the operation of the variable frequency power supply 11 to ensure that the magnetron 12 is protected from operating in an over temperature condition.
  • the cooling unit 14 in the microwave device 10 fails, for example, a malfunction of a cooling water pump, a fan, or the like, it is extremely easy to cause the variable frequency power supply 11 to operate at the minimum power set by it, and the magnetron 12 will also Over temperature, therefore, it is very necessary to adopt a shutdown strategy for the variable frequency power supply at this time.
  • the above embodiments illustrate an adjustment method by "calculating the anode temperature of the magnetron according to the anode voltage of the magnetron and further adjusting the output power of the variable frequency power source according to the anode temperature of the magnetron",
  • the internal controller 116 can also directly determine the output power of the variable frequency power supply 11 according to the anode voltage of the magnetron 12 to further adjust the output power of the variable frequency power supply 11. Therefore, first, the internal controller 116 acquires a preset association table.
  • the preset association table is obtained by the user in advance according to practical experience, wherein the association table prestores a mapping relationship between the anode threshold voltage of the magnetron 12 and the output power of the variable frequency power source 11.
  • the internal controller 116 traverses the preset correlation table according to the calculated anode threshold voltage of the magnetron, and finds the magnetron 12 from the preset correlation table. The output power of the variable frequency power supply 11 corresponding to the anode threshold voltage. Finally, the internal controller 116 adjusts the current output power of the variable frequency power supply 11 to the found output power, thereby completing the adjustment of the anode temperature of the magnetron 12.
  • the embodiment of the present application directly collects the anode voltage capable of accurately reflecting the magnetron 12 to indirectly obtain the anode threshold voltage of the magnetron 12, thereby accurately determining the anode temperature, it has at least the following advantages:
  • the temperature parameter detected by the temperature sensor disposed in the outer casing of the magnetron 12 is used to directly detect the temperature of the magnetron. Since the outer casing of the magnetron 12 is an iron shell, the thermal conductivity is not good, and is different. Under the cooling conditions, the temperature of the outer casing does not truly reflect the true anode temperature of the magnetron 12.
  • the cost of setting the temperature probe is relatively high, and the corresponding circuit is needed to process the temperature information. Therefore, such a method has no cost advantage.
  • the output power of the variable frequency power supply 11 is adjusted to adjust the anode temperature of the magnetron 12 to ensure that the magnetron 12 avoids over temperature damage.
  • the anode threshold voltage applied across the magnetron it is also possible to determine the anode by the correspondence between the anode threshold voltage of the magnetron and the input power of the variable frequency power source. Threshold voltage. For example, when the input power of the variable frequency power supply falls within a preset power range, it is determined that the anode voltage corresponding to the input power of the variable frequency power source is the anode threshold voltage.
  • the preset power range is determined according to the design of the product, and the preset power range may also be a single point input power value, for example, an instantaneous power value at a specific moment.
  • the following embodiments may be used to adjust the output power of the variable frequency power supply, for example, by determining the anode current flowing through the magnetron, according to the anode current. Adjust the output power of the variable frequency power supply.
  • the anode current is Ia or Ib or is located in the vicinity of Ia or Ib
  • the anode voltage corresponding to Ia or Ib is the anode threshold voltage VT
  • the anode current corresponding to the region near Ia or Ib corresponds to
  • the anode voltage can be estimated to be equivalent to the anode threshold voltage VT.
  • the user can establish a mapping table between the anode threshold voltage VT and the anode current Ia or Ib, by passing the sampled anode current Ia or Ib looks up the mapping table to determine the anode threshold voltage VT.
  • the input power of the variable frequency power supply can also adjust the input power of the variable frequency power supply according to the input power of the variable frequency power supply.
  • the input power of the variable frequency power supply is functionally related to the anode current Ia or Ib, and the anode threshold voltage VT of each magnetron is mapped to the anode current Ia or Ib.
  • the user can establish a mapping table for the anode threshold voltage VT and the input power, and determine the anode threshold voltage VT by looking up the mapping table according to the input power.
  • the user can establish a mapping table between the anode threshold voltage VT and the anode voltage, and determine the anode threshold voltage VT by looking up the mapping table according to the anode voltage.
  • the high voltage rectification filtering unit 114 includes a first diode D1, a second diode D2, a first capacitor C1, and a second capacitor C2.
  • the first voltage sampling circuit 117 includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is connected to the first node 116a, and the other end of the first resistor R1 and one end of the second resistor R2 are connected to the second node. 116b, the other end of the second resistor R2 is grounded, wherein the first output voltage V0 is collected from the second node 116b.
  • V0 Ebm * R2 / (R1 + R2). Therefore, by obtaining V0, Ebm can be calculated.
  • variable frequency power supply 11 in order to increase the amplitude of the sampled voltage and the carrying capacity, as shown in FIG. 5a, the difference from the embodiment shown in FIG. 5 is that the variable frequency power supply 11 further includes an amplifying circuit 118, an amplifying circuit.
  • the input of the 118 is coupled to the first output of the first voltage sampling circuit 117, and the output of the amplifying circuit 118 is coupled to the internal controller 116.
  • the amplification current 118 can be an operational amplifier that can increase the voltage amplitude of the first output voltage and improve the carrying capacity.
  • the microwave device 10 further includes an external controller 15 that is connected to the variable frequency power supply 11.
  • the external controller 15 transmits the target power information to the variable frequency power supply 11 to convert the power conversion unit 112 in the variable frequency power supply 11 into a desired pulse width modulation signal (Pulse Width Modulation, PWM) or a pulse frequency modulation signal (Pulse Frequency Modulation, PFM). ) or a mixture of the two, working at rated power.
  • PWM pulse width modulation signal
  • PFM pulse frequency modulation signal
  • the external controller 15 also receives various types of control information fed back by the variable frequency power supply 11 to adjust the output power of the variable frequency power supply, thereby achieving the purpose of flexibly adjusting the system power and monitoring the operating condition of the variable frequency power supply 11.
  • control logics for adjusting the temperature of the magnetron described in the above various embodiments may exist in the form of software modules, and the software modules may not only store in the form of instructions.
  • the internal controller 116 in the variable frequency power supply 11 is also stored in the external controller 15.
  • the embodiment of the present application further provides a magnetron temperature adjustment system.
  • the magnetron temperature adjustment system 20 includes a magnetron 21, a variable frequency power supply 22, a second voltage sampling circuit 23, an external controller 24, a working chamber 25, and a cooling unit 26.
  • the variable frequency power supply 22 is connected to the magnetron 21 for driving the magnetron 21;
  • the second voltage sampling circuit 23 is coupled between the variable frequency power supply 22 and the magnetron 21 for sampling the second output voltage of the variable frequency power supply 22,
  • the two output voltages correspond to the anode voltages applied across the magnetron 21 for sampling the anode current flowing through the magnetron 21.
  • the external controller 24 is connected to the output of the second voltage sampling circuit 23 and the variable frequency power supply 22, respectively.
  • the magnetron 21, the variable frequency power supply 22, the second voltage sampling circuit 23, and the external controller 24 can refer to the explanations made in the above embodiments without causing content conflicts. Narration.
  • the external controller 24 herein stores a plurality of instructions for adjusting various control logics of the magnetron temperature, and the internal controller of the variable frequency power supply 22 serves as a control core for the normal operation of the variable frequency power supply 22. .
  • the second voltage sampling circuit 23 includes: a first winding W1, a third capacitor C3, a fourth capacitor C4, and a third a diode D3, a fourth diode D4, and a third resistor R3, wherein the first winding W1 and the secondary winding W2 and W3 of the high voltage rectifying and filtering unit of the variable frequency power supply 22 have a proportional relationship, so that the third resistor is obtained.
  • the voltage V0 at both ends of R3 (that is, the second output voltage) can calculate the anode voltage Ebm according to the proportional relationship.
  • the voltage waveform of the second output voltage V0 and the voltage waveform of the anode voltage Ebm are both sinusoidal.
  • Ebm can be calculated by obtaining V0.
  • the anode threshold voltage can be calculated, and the temperature of the magnetron can be adjusted according to the anode threshold voltage.
  • the magnetron temperature adjustment system 20 can be applied to any type of microwave device.
  • the internal controller or the external controller functions as a controller, which may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), A microcontroller, ARM (Acorn RISC Machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components.
  • the controller can be any conventional processor, controller, microcontroller or state machine.
  • the controller can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • FIG. 9 is a schematic structural diagram of a controller according to an embodiment of the present application.
  • the controller 30 includes: at least one processor 31 and a memory 32 communicatively coupled to the at least one processor 31; wherein, a processor 31 is shown in FIG.
  • the processor 31 and the memory 32 may be connected by a bus or other means, as exemplified by a bus connection in FIG.
  • the memory 32 stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor 31 to perform the magnetron temperature adjustment described above Control logic.
  • the controller 30 can adjust the output power of the variable frequency power supply in time to adjust the anode temperature of the magnetron to ensure that the magnetron avoids over temperature damage.
  • an embodiment of the present application provides a magnetron temperature adjustment device.
  • the magnetron temperature adjustment device is a software system that can be stored in the internal controller 116 in the variable frequency power supply 11 illustrated in Figures 2 and 6, or in the external controller illustrated in Figure 7.
  • the magnetron temperature adjustment device includes a plurality of instructions stored in a memory, the processor can access the memory, and invoke instructions to perform the control logic of the magnetron temperature adjustment.
  • the magnetron temperature adjustment device 40 includes a determination module 41 and an adjustment module 42.
  • the determining module 41 is configured to determine an input current of the anode current or the variable frequency power source flowing through the magnetron or an anode voltage applied to both ends of the magnetron, and the input power or output power of the variable frequency power source is used to drive the magnetron to operate.
  • the adjustment module 42 is configured to adjust the output power of the variable frequency power supply according to the anode current or the input power or the anode voltage.
  • the adjustment module 42 includes a determining unit 421, a calculating unit 422, and an adjusting unit 423.
  • the determining unit 421 is configured to determine an anode voltage applied to both ends of the magnetron, an equivalent resistance of the magnetron, and an output power of the variable frequency power source
  • the calculating unit 422 is configured to calculate an anode voltage according to the magnetron, a magnetron equivalent resistance, and
  • the output power of the variable frequency power supply calculates the anode threshold voltage of the magnetron
  • the adjusting unit 423 is configured to adjust the output power of the variable frequency power supply according to the anode threshold voltage of the magnetron.
  • the magnetron temperature adjusting device 40 can adjust the output power of the variable frequency power supply in time to adjust the anode temperature of the magnetron to avoid excessive temperature damage of the magnetron.
  • the determining unit 421 includes a first obtaining subunit 4211 and a first calculating subunit 4212.
  • the first obtaining subunit 4211 is configured to obtain the input power and the input voltage of the variable frequency power supply; the first calculating subunit 4212 is configured to calculate the output power of the variable frequency power supply according to the corresponding relationship between the input power, the input voltage, and the power efficiency of the variable frequency power supply.
  • the adjustment unit 423 includes a second calculation subunit 4231 and a first adjustment subunit 4232.
  • the second calculating subunit 4231 is configured to calculate the anode temperature of the magnetron according to the anode threshold voltage of the magnetron; the first regulating subunit 4232 is configured to adjust the output power of the variable frequency power source according to the anode temperature of the magnetron.
  • the adjustment unit 423 includes a second acquisition subunit 4233, a lookup subunit 4234, and a second adjustment subunit 4235.
  • the second obtaining subunit 4233 is configured to obtain a preset association table, where the association table prestores a mapping relationship between an anode threshold voltage of the magnetron and an output power of the variable frequency power source; the searching subunit 4234 is configured to use the preset association table. Finding the output power of the variable frequency power supply corresponding to the anode threshold voltage of the magnetron; the second regulating subunit 4235 is for adjusting the output power of the variable frequency power supply to the found output power.
  • the first adjustment subunit 4232 includes a determination subunit 42321, a reduction subunit 42322, and a maintenance subunit 42323.
  • the determining subunit 42321 is configured to determine whether the anode temperature of the magnetron is greater than a preset temperature threshold, and the reducing subunit 42322 is configured to reduce the output power of the variable frequency power supply if greater than, and maintain the subunit 42233 for less than, maintain the operation of the variable frequency power supply. .
  • the reducing subunit 42322 is specifically configured to: determine an output power of the variable frequency power supply; determine whether the output power of the variable frequency power supply is greater than a preset minimum power; if greater than, maintain the operation of the variable frequency power supply; if less, stop the frequency conversion power supply work.
  • the device embodiment and the foregoing embodiments are based on the same concept, and the content of the device embodiment may refer to the foregoing embodiments, and the details are not described herein.
  • an embodiment of the present application provides a method for adjusting a temperature of a magnetron.
  • the function of the magnetron temperature adjustment method of the embodiment of the present application is performed by the software system of the magnetron temperature adjustment device described above with reference to FIGS. 10 to 14, which can also be performed by means of a hardware platform.
  • the magnetron temperature adjustment method can be performed in an electronic device of a suitable type of processor having a computing capability, such as a single chip microcomputer, a digital signal processing (DSP), a programmable logic controller (Programmable Logic Controller, PLC). )and many more.
  • DSP digital signal processing
  • PLC programmable Logic Controller
  • the function corresponding to the magnetron temperature adjustment method of each of the following embodiments is stored in the form of an instruction on the memory of the electronic device, and when the function corresponding to the magnetron temperature adjustment method of each of the following embodiments is to be performed, the electronic device
  • the processor accesses the memory, retrieves and executes the corresponding instructions to implement the functions corresponding to the magnetron temperature adjustment methods of the various embodiments described below.
  • the memory is a non-volatile computer readable storage medium that can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the magnetron temperature adjustment device 40 in the above embodiments.
  • Program instructions/modules e.g., the various modules and units described in Figures 10-14
  • the processor performs various functional applications and data processing of the magnetron temperature adjustment device 40 by executing non-volatile software programs, instructions, and modules stored in the memory, that is, implementing the magnetron temperature adjustment device of the following embodiment
  • the memory may include a high speed random access memory, and may also include a non-volatile memory such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.
  • the memory optionally includes a memory remotely located relative to the processor, the remote memory being connectable to the processor over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
  • the program instructions/modules are stored in the memory, and when executed by the one or more processors, perform a magnetron temperature adjustment method in any of the above method embodiments, for example, performing the following embodiments
  • the various steps shown in Figures 15 through 20; the functions of the various modules and units described in Figures 10 through 14 can also be implemented.
  • the magnetron temperature adjustment method 50 includes:
  • Step 51 determining an anode current flowing through the magnetron or an input power of the variable frequency power source or an anode voltage applied to both ends of the magnetron, and input power or output power of the variable frequency power source is used to drive the magnetron to operate;
  • Step 52 Adjust the output power of the variable frequency power supply according to the anode current or the input power or the anode voltage.
  • step 51 during the process of determining the anode voltage applied to both ends of the magnetron, it is also possible to determine the anode voltage corresponding to the input power of the variable frequency power source as the anode threshold when the input power of the variable frequency power source falls within the preset power range. Voltage.
  • the output power of the variable frequency power supply can be adjusted in time to adjust the anode temperature of the magnetron to avoid excessive temperature damage of the magnetron.
  • step 52 includes:
  • Step 521 determining an anode voltage applied to both ends of the magnetron, an equivalent resistance of the magnetron, and an output power of the variable frequency power source;
  • Step 522 Calculate an anode threshold voltage of the magnetron according to an anode voltage of the magnetron, an equivalent resistance of the magnetron, and an output power of the variable frequency power source.
  • Step 523 Adjust the output power of the variable frequency power supply according to the anode threshold voltage of the magnetron.
  • step 521 includes:
  • Step 5211 Obtain an input power and an input voltage of the variable frequency power supply
  • Step 5222 Calculate the output power of the variable frequency power supply according to the corresponding relationship between the input power, the input voltage, and the power efficiency of the variable frequency power supply.
  • step 523 includes:
  • Step 5231 calculating an anode temperature of the magnetron according to an anode threshold voltage of the magnetron
  • Step 5233 adjusting the output power of the variable frequency power supply according to the anode temperature of the magnetron
  • step 523 includes:
  • Step 5232 Obtain a preset association table, and the association table prestores a mapping relationship between an anode threshold voltage of the magnetron and an output power of the variable frequency power supply;
  • Step 5234 Find, from a preset association table, an output power of the variable frequency power supply corresponding to an anode threshold voltage of the magnetron;
  • Step 5236 Adjust the output power of the variable frequency power supply to the found output power.
  • step 5233 includes:
  • Step 52331 determining whether the anode temperature of the magnetron is greater than a preset temperature threshold
  • Step 52332 if greater than, reduce the output power of the variable frequency power supply
  • Step 52333 if less than, maintain the operation of the variable frequency power supply.
  • step 52332 includes:
  • Step 523321 determining an output power of the variable frequency power supply
  • Step 523322 Determine whether the output power of the variable frequency power supply is greater than a preset minimum power
  • Step 523323 if greater than, maintaining the operation of the variable frequency power supply
  • Step 523324 if less than, stops the operation of the variable frequency power supply.
  • the device embodiment and the method embodiment are based on the same concept, and the content of the method embodiment may refer to the device embodiment, and details are not described herein.
  • an embodiment of the present application provides a non-transitory computer readable storage medium storing computer executable instructions, the computer executable instructions A method for causing a microwave device to perform a magnetron temperature adjustment method according to any one of the preceding claims, for example, performing a magnetron temperature adjustment method in any of the above method embodiments, for example, performing a magnetron temperature in any of the above device embodiments Adjustment device.
  • the output power of the variable frequency power supply can be adjusted in time to adjust the anode temperature of the magnetron to avoid excessive temperature damage of the magnetron.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Microwave Tubes (AREA)

Abstract

L'invention concerne un procédé de régulation de température de magnétron, un dispositif associé, un contrôleur, une alimentation électrique à fréquence variable, un système de régulation de température de magnétron, et un dispositif hyperfréquence. Le procédé de régulation de température de magnétron consiste : à déterminer un courant d'anode circulant à travers un magnétron ou une puissance d'entrée d'une alimentation électrique à fréquence variable ou une tension d'anode appliquée à l'une ou l'autre des extrémités du magnétron, la puissance d'entrée ou une puissance de sortie de l'alimentation électrique à fréquence variable servant à entraîner le fonctionnement du magnétron (51) ; et à réguler la puissance de sortie de l'alimentation électrique à fréquence variable sur la base du courant d'anode ou de la puissance d'entrée ou de la tension d'anode (52). La puissance de sortie de l'alimentation électrique à fréquence variable peut donc être régulée rapidement afin de réguler la température d'anode du magnétron, empêchant ainsi que le magnétron soit endommagé pour cause de surchauffe.
PCT/CN2018/083390 2017-10-30 2018-04-17 Procédé, dispositif et système de régulation de température de magnétron, alimentation électrique à fréquence variable, et dispositif hyperfréquence WO2019085408A1 (fr)

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KR1020207014410A KR102319930B1 (ko) 2017-10-30 2018-04-17 마그네트론 온도 조절 방법, 장치 및 시스템, 가변 주파수 전원 및 마이크로파 기기
EP18873316.6A EP3706512B1 (fr) 2017-10-30 2018-04-17 Procédé, dispositif et système de régulation de température de magnétron, alimentation électrique à fréquence variable, et dispositif hyperfréquence
JP2020524364A JP6987989B2 (ja) 2017-10-30 2018-04-17 マグネトロン温度調節方法、装置及びシステム、可変周波数電源及びマイクロ波機器
US16/857,314 US11696376B2 (en) 2017-10-30 2020-04-24 Method, device, and system for regulating temperature of magnetron, variable-frequency power supply, and microwave apparatus

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CN201711035721.6 2017-10-30

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CN107896393B (zh) 2017-10-30 2020-01-03 深圳麦格米特电气股份有限公司 磁控管温度调节方法、装置及系统、变频电源及微波设备
CN110530553B (zh) * 2019-08-07 2020-11-06 深圳麦格米特电气股份有限公司 一种磁控管状态检测方法、装置、控制器、电路及系统
CN112714528B (zh) * 2020-12-31 2023-04-21 广东美的厨房电器制造有限公司 变频器电路的控制方法、控制装置、磁控管驱动电路

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KR102319930B1 (ko) 2021-10-29
JP2021501452A (ja) 2021-01-14
US20200253006A1 (en) 2020-08-06
EP3706512A4 (fr) 2021-08-11
JP6987989B2 (ja) 2022-01-05
CN107896393B (zh) 2020-01-03
KR20200074182A (ko) 2020-06-24
CN107896393A (zh) 2018-04-10
EP3706512A1 (fr) 2020-09-09
EP3706512B1 (fr) 2024-05-22

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